Add include for perror

src/network/poller.cpp

@@ -1,10 +1,11 @@
 #include <network/poller.hpp>
 
 #include <assert.h>
+#include <stdio.h>
+
 #include <cstring>
 #include <iostream>
 
-
 Poller::Poller()
 {
   std::cout << "Poller()" << std::endl;

src/network/socket_handler.cpp

@@ -3,11 +3,12 @@
 #include <utils/scopeguard.hpp>
 #include <network/poller.hpp>
 
-#include <sys/types.h>
 #include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
 #include <cstring>
 #include <netdb.h>
-#include <unistd.h>
+#include <stdio.h>
 
 #include <iostream>